Feeding mechanism for rock drills



Aug. 6, 1940. A. FEUCHT FEEDING MECHANISM FOR ROCK DRILLS Filed March 21, 1939 2 Sheets-Sheet l INVENTOR ALBERT BY FEl/OVT ATTORNEY Aug. 6, 1940. A. FEUCHT FEEDING MECHANISM FOR ROCK DRILLS Filed March 21, 1939 2 Sheets-SI1eet 2 ATTORNEY Patented Aug. 6, 1 940 '7 I UNITED STATES PATENT OFFICE v 2,210,660 FEEDING lVIECI-IANISM FORROCK DRILLS Albert Feucht, Garfield Heights, Ohio, assignor to The Cleveland Rock Drill Company, Cleve-,- land, Ohio, a corporation of Ohio Application March 21, 1939, Serial No. 263,155

9 Claims. (01. 255 -45) This invention relates broadly to rock drills, formed with the usual guideways 22' fitted over but more particularly to a feeding mechanism for the support for free slidable guided movement ro k drills f th drifte type, thereon. Below each lug 21, the cradle is formed One object of this invention is to produce a with a longitudinally apertured boss 29 each ac- 5 rock drill with a feeding mechanism actuated commodating the head 30 of a bolt 3| extending '5" by virtue of the jars imparted to the drill during longitudinally therefrom through a similar boss normal operation. 32 also formed integral with the cradle, which Another object of this invention is to produce bolt is held in place by a nut 33 engaging the a rock drill with a feeding mechanism of simple boss 32. Slidable on each bolt 3|, there is a construction forming a compact assembly which guideway 34 formed integrally with a feed motor 10 is strong, durable and efficient. housing 35 located above the cradle 22. The

Other objects and advantages more or less guideways 34 are shorter than the longitudinal ancillary to the foregoing reside in the specific space between the cradle-bosses 29 and 32 to construction and aggroupment of the elements enable relative longitudinal movement there- 5 peculiar to this structure, as will become apparbetween, and are normally maintain d i t cut from a more complete examination of this the bosses 32 by compression springs 33 interspecification. posed between the ends of the guideways 34 and In the drawings: heads 3!) of the bolts 3|. Fig. l is a longitudinally side elevational view Within the casing 35, there is a sprocket wheel of arock drill embodying the invention. or feed element 31 rotatable within a longitu- 20 Fig. 2 is a top plan .view of the rear end portion dinal vertical plane relative to the support. On of the rock drill shown in Fig. 1. one side the wheel 3i is formed with a shafted Fig. 3 is an enlarged cross sectional view taken portion 38, and on the other side with an enthrough a plane indicated by line 3-3 in Fig. 1. larged ring 39, both being adequately journaled Fig. 4 is a view corresponding to Fig. 1 of the within the housing 35. Passing over the sprocket 25 feeding mechanism illustrating parts in a differwheel 31, there is a chain or feed member 48 ent position. having one end secured to the rear end of the Fig. 5 is a longitudinally sectional view taken support 20 by a bolt 4|, and the other end to the in a plane indicated by line 5-5 in Fig. 2. front end of the support by a tension adjusting Fig. 6 is an enlarged cross sectional view taken bolt' 42. To maintain the chain 40 in operative 30 in a plane indicated by line 6"-6 in Fig. engagement with a major portion of the sprocket Figs. 7, 8 and 9 are views similar to Fig. 6 illus- Wheel 31, there are two rollers 43 and 44 engaged trating movable parts in different positions. by the chain as clearly shown in Fig. 5.

Fig. 10 is an enlarged cross sectional view taken Internally, the ring 39 is formed with ll-shaped in a plane indicated by line ill-All in Fig. l. teeth 45, the purpose of which will be explained 5 Fig. 11 is a longitudinally sectional view taken later. Inside of the ring 39, there is a stationary in a plane indicated by line ll-ll in Fig. 1. head 46 formed with a shank 4'! extending Referring to the drawings; 26 represents the through the housing and held in position by a usual support having a drill 2i longitudinally nut 48. The head 46 has two branches 453 and slidable thereon. In the present construction, the 50, the former carrying a pawl 5i engagealile 40 drill instead of being formed with the usual with one side of the teeth 45, and the latter guidewa-ys integral therewith for guided slidable carrying a similar pawl 52 engageable withthe engagement on the support, is detachably secured other side of the teeth 45. The two pawls 5| and on a cradle 22 by clamps 23, one of which is 52 are constantly urged outwardly, each by a 5 shown in Fig. 1, which clamps preferably fit on spring pressed plunger 53. Rotatable within the r the drills rod 24, while the head 2'5 of the drill shank 41 of the head 46, there is a stem i l'havis provided with two rearwardly extending lugs ng its free end extending out of the housin 26 located between corresponding lugs 21 extend- 35 to receive one end of a vertical link or lever ing upwardly from the cradle 22 and detachably 55 secured thereon against rotation by a key 56 secured thereto by a cross bolt 28.. In this cond a a s endWiSe mOVementy a Hut '5- Ol 50 struction, the drill 2i and cradle 22, when mountits other end, the stem 54 is provided witli' a ed as shown in Fig. l, constitutes a drilling appendulum or oscillable member 58 located within paratus of the drifter type wherein the drill the ring 39 and extending radially of the head may be removed from the cradle and used as a 46. This pendu um also es a p l 5 conhand supported drill. The cradle 22 is of course stantly urged into engagement with one side of 55 the teeth 45 of the ring 39 by a spring pressed plunger 60.

Also mounted within the casing 35 for rotation relative to the ring 39, there is a pawl operating circular plate 5| formed with an annular marginal bead 62 engageable with a portion of the pawls 5|, 52 and 59, which extends beyond the adjacent end of the ring 39. This annular head is provided with two radially disposed slots 63 and 64, the former enabling engagement of the pawls 5| and 52 and the latter of the pawl 59 with the teeth 45 of the ring 35. This plate is rotatable through a handle 65 locate d on one side of the housing 35 and having a stem 66 within the housing ending adjacent the plate 6|. This stem 66 is connected to the plate 6! by a pin Bl located in eccentric relation with respect to the center axis of the stem in a manner eflecting rotation of the plate upon rotation of the handle 55.

The vertical link 55 is provided with a trunnion 65 having pivotally mounted thereon one end of a horizontal link or lever 69, which link has its other end pivotally connected to one of the lugs 21 of the cradle 22 by a cross bolt 10.

In the operation of the device, when the rock drill 2| has motive fluid admitted therein for reciprocating its piston in the usual manner, the reversal of the pistons stroke in the rock drill will impart forward and backward jars or reciprocatory motion to the drill and consequently to the cradle 22 relative to the support 26. When it is desired to feed the drill toward the work, the handle 65 may be rotated to position the plate 6| as shown in Figs. 7 and 8. In this instance, the pawls 52 and 59 located within the slots 63 and 64 respectively are engageable with one side of the teeth 45 of the ring 39. During the rearward jars of the rock drill 2|, the sprocket wheel 31 engaging the chain 4|! will tend to rotate in a clockwise direction in Fig. 5, which rotation is prevented by the engagement of the pawl 52 with the teeth 45 of the ring 39, thereby maintaining the housing 35 stationary relative to the support 20. During this rearward movement of the rock drill, its cradle 22 will move therewith to compress the springs 36. In this instance, the vertical link 55 connected to the cradle by the horizontal link 69 will be moved from the position in Fig. 1 to the position in Fig. 4, thus eifecting' movement of the pendulum 58 from the position in Fig. 7 to the position in Fig. 8. As the rock drill is moved forwardly during its forward jars, the energy stored within the springs 36 will cause the cradle together with the drill to move forwardly relative to the housing 35, thereby imparting rotation to the pendulum 55 from the position in Fig. 8 to the position in Fig. 7. Due to the operative engagement of the the ring 39, this ring will be rotated by the pendulum in a counterclockwise direction in Fig. 8, resulting in the rotation in the same direction of the sprocket wheel 39 for imparting feeding motion to the rock drill due to the operative en gagement of the sprocket wheel with its stationary chain 48. During this forward movement of the rock drill, it will be understood that after the energy stored within the springs 35 has been dissipated, the bosses 32 of the cradle engaging the guideway 34 of the housing 35 will also impart forward movement to the housing resulting in the rotation of the sprocket wheel 39 in a counterclockwise direction in Fig. 5, which rotation is not prevented by the engagement of the pawl 52 with the teeth 45 of the ratchet ring 39.

pawl 59 with the teeth 45 of Consequently, it is clear that the swinging movement of the pendulum 58 results in a feeding motion of the rock drill additional to that normally transmitted thereto by virtue of the engagement of the cradle bosses 32 with the guideways 34 of the housing 35, which engagement is responsive to the normal forward jars of the drill.

When it is desired to feed the rock drill away from the work, the handle 65 may be rotated to position the plate 6| as shown in Fig. 9. In this instance, the pawl 59 of the pendulum 58, together with the pawl 52 of the head 46, is maintained out of engagement with the teeth of the ratchet ring, while the pawl 5| now located within the slot 63 is engaging the other side of the ratchet ring teeth 45. The backward jars of the rock drill transmitted to the cradle 22 will in turn be transmitted to the housing 35 by the compression springs 56, thereby causing the sprocket wheel 3! due to its engagement with the stationary chain 55 to rotate in a clockwise direction in Fig. 5. In this instance, rotation of the sprocket wheel 31 in a counterclockwise direction in Fig. 5 by virtue of the forward jars of the drill, is prevented by the engagement of the pawl 5| with the ratchet ring teeth 45. Consequently, it will be understood that the rearward jars of the rock drill are utilized to cause intermittent rotary motion of the sprocket wheel 31 in a clockwise direction in Fig. 5, resulting, due to the operative engagement of the sprocket wheel 31 with the chain 40, in a step by step rearward feeding motion of the rock drill 2|.

When it is desired to lock the rock drill 2| on' the support 2!), the handle 65 may be rotated to position the plate 6| as shown in Fig. 6. In this instance, the pawls 5| and 52 located within the slot 63 are capable of engagement with opposed sides of the teeth 45 of the ratchet ring 39, thereby preventing rotation of the ring and consequently of the sprocket wheel 37 in either direction and causing the rock drill to be locked to the chain 40 against movement relative to the support .20.

Although the foregoing description is necessarily of a detailed character, in order to completely set forth the invention, it is to be understood that the specific terminology is not intended to be restrictive or confining and it is to be further understoodthat various rearrangements of parts and modifications of structural detail may be resorted to without departing from the scope or spirit of the invention as herein claimed.

I claim:

1. In a drilling apparatus, the combination of a support, of a drill slidable on the support having reciprocatory motion imparted thereto, of a rotatable feed element carried by the drill, of means on the support operatively associated with said element whereby its rotation results in the feeding motion of the drill, connecting means between the drill and the feed element enabling limited reciprocatory motion of the drill relative to the element, and means deriving motion from said relative reciprocatory motion for actuating said member.

2. In a drilling apparatus, the combination of a support, of a drill slidable on the support having reciprocatory motion imparted thereto, of a feeding mechanism for the drill including a feed element associated with the drill for slidable movement therewith and capable of rotation for imparting feeding motion thereto, connecting means between the drill and said element enabling relative reciprocatory motion therebetween, and means deriving motion from said relative reciprocatory motion for actuating said element.

3. In a drilling apparatus, the combination with a support, of a drill slidable on the support having jars imparted thereto, of a feeding mechanism for the drill including a feed member secured to and extending longitudinally of the support, a rotatable feed element connected to the drill for limited longitudinal reciprocatory movement relative thereto resulting from said jars, said element being operatively associated with said member for imparting feeding motion to the drill upon rotation of said element, and means deriving motion from said relative longitudinal reciprocatory movement for rotating said element.

4. In a drilling apparatus, the combination with a support, of a drill slidable on the support having jars imparted thereto, of a feeding mechanism for the drill including a feed member secured to and extending longitudinally of the support, a rotatable element carried by the drill operatively associated with said member for effecting feeding motion of the drill upon rotation of said element, connecting means between the drill and said element enabling limited relative longitudinal movement therebetween resulting from said jars, and means deriving motion from said relative longitudinal movement for rotating said element.

5. In a drilling apparatus, the combination of a support, of a drill slidable on the support having reciprocation imparted thereto relative to. the support, of a feeding mechanism including a housing on the support capable of slidable movement relative thereto, a rotatable element in said housing, of means on the support operatively associated with said element whereby rotation of said element results in the feeding motion of the drill, spring means between the drill and the housing enabling limited reciprocatory movement of the drill relative to the housing, said spring means having energy stored therein by virtue of said relative movement in one direction, and lever means operatively associated with said element responsive to the energy stored within said spring means for rotating said element.

6. In a drilling apparatus, the combination of a support, of a drill slidable on the support having reciprocatory motion imparted thereto relative to the support,'of a feed mechanism including a housing, a rotatable element and an oscillable member within said housing, rotation transmitting means between said member and element whereby oscillatory motion of the former results in a step by step rotary motion of the latter, means on the support operatively associated with said element whereby its rotation results in the feeding motion of the drill, connecting means between the drill and the housing enabling limited reciprocatory movement of the drill relativeto the housing, and means deriving motion from said relative movement for imparting oscillatory movement to said member.

7. In a drilling apparatus, the combination with a support having a drill slidable thereon, of a feeding mechanism including a chain secured to and extending longitudinally of the support, a sprocket wheel carried by the drill operatively engaging said chain, connecting means between said drill and sprocket wheel enabling limited relative longitudinal movement therebetween, said drill having jars imparted thereto efiecting said relative longitudinal movement, and means deriving motion from said movement for imparting intermittent rotation to said sprocket wheel in one direction.

8. In a drilling apparatus, the combination of a support, of a drill slidable on the support having reciprocatory motion imparted thereto relative to the support, of a housing carried by the support for slidable movement relative thereto, a rotatable element and a swingable member within said housing, means extending longitudinally of the support operatively associated with said element whereby its rotation efiects feeding movement of the drill, connecting means between said element and member effecting rotation of the element upon swinging motion of the member, connecting means between the drill and housing enabling limited relative reciprocation therebetween, and means deriving motion from said relative reciprocation for imparting swinging motion to said member.

9. In a drilling apparatus, the combination of a support, of a drill slidable on the support having reciprocatory motion imparted thereto relative to the support, of a feeding mechanism for the drill including a housing carried by the support for slidable movement relative thereto, a feed member extending longitudinally of the support, an element within said housing capable of a predetermined motion, said element being operatively associated with said member whereby the predetermined motion of the formerv relative to the latter results in the feeding motion of the drill, connecting means between the drill and said housing enabling limited relative reciprocation therebetween, and means deriving motion from said relative reciprocation for imparting said predetermined motion to said element.

ALBERT FEUCHT. 

